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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa89dc4db806dc8e6452f8b175dabf66668894663a260d63b219665da9ee8848' 
  AND token = 'fNmakjDaf6gE8yusvPkUkNPrTCQiuFoOwCv073AZdF4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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