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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9a2804d673f509a52a7d13f5b90d4698773c39310734f8eec78072e919dbedc' 
  AND token = 'zu6QBoVkYtJ2eBBtOea9Yxq3NJai0Ef3fbUkOxRR/w4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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