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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a34bf3bd9d15f48a711a20dd8a4c3dfc223e45065e1f695a4b40b7729b34288' 
  AND token = 'dW8TxklgWQA4cu2M29Vq8MP6eSwFN1B9+wNSN7QXE7E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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