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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c648e06dec93fcc9746c6a37b715854d17b4d2468569ae153f4e99a3cad9febd' 
  AND token = 'WL78kEjBCdqY1ruRz/HKIPBEaBapO3bj3n5egbxn6B4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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