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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee08e05db34c7477105b0227148c93a0b624ba6dcbe30ea61df87ea7ed91a11a' 
  AND token = 'uO31b/JdYnixBuBY7ub5GuIjtbpRjBF3B3nZ/bwbNf4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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