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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd4d7b203a93caabd7c76a8d6b630dda7aca74a2f7b3009b2d5fc2dffef20c7da' 
  AND token = 'q37GUcUYi82zmpudfRXXgyGT4h7a09Njmm4mRjw9HAk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00079

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}