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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef33a93d6cdbc52f5b1e71ac76c5ed4364924ff1b74b2d5bc13640782f99b579' 
  AND token = 'ocZOmm8sQUZWmeqNtM7bAbJTgSW9CRRCXpoNK87bJCI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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