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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '463c23b36d66c25cb662e4455daab72565e9f12417ba4ae54939854ccb532c41' 
  AND token = 'ipiu3c8cW4LMP0OO+o6x8h30TqHTstLyeIEqt1QkAkw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00065

JSON explain

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