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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97a24d049c8eebc11c5b6b1565e875bfd396492c8adeac2db1229668d7c90a0c' 
  AND token = 'nI72jYAgENdtk2dsadVNpO6QeRGzpWzSYxdpmRc6/mI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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