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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '303f2145381350c339a04d25f865524c45a557ef0507d8c85cca8db0a7cc1cdd' 
  AND token = '6Y6v0pe47C1VQjdrQ7eJycNadOXjGgtRyvTTuuA6Muo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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