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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a876ca6e7e33b3fa7195d6d96bab5317baef6c6cbc34788d8c2b18d74acea48' 
  AND token = 'YW5zsaT3V3QbuySy0Lq18YM5CxEk0JGUYt6f4NxNfzY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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