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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '299d285e580cdf6d5c49bf14c1ab5ff6a1c9e89beeb91fd7140c3df670223f69' 
  AND token = 'xaFrFMPTmoQmAtcEW5HpfheHW3tCCkgJT+5O6ZzN5PQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00127

JSON explain

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