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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b66268286501ded32b5b7ab4f26e7e87a1009e701b2b5149dcbf7a3e95cba74f' 
  AND token = 'gRt0exTfLRcWcjJXfoyGwXhJ4PRu9fWcBo6yxNf9Mr0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00102

JSON explain

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