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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9c3b7da27db9f980780c2b120150c76e77f9c8de1366c150c33c6b2fc07aa35' 
  AND token = '4tFqzrN9h++Pl+9XRiBdt3NpOQgP96yKfJF6CJ/U9Tc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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