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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f10dd6bf95f4a8e6b336f8e898aa6f4ca0d937d569d36bf6577632a98541d43e' 
  AND token = 'teCxZs8z4MRhx71rHfbHiDEW6EqziCzc3WR9mKPeazg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00081

JSON explain

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