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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b0045cff575f9ee53b1811c2da4438b052641e8e57f130f602e7864eb1b5657b' 
  AND token = 'vtdyCabfy9iV7UBFrcJcjq70bpSEHE3Ms92NP8aYYA4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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