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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce7417668ccccc625fb34217f13e48404596b0c318cc220d7b1a8a1491f201cb' 
  AND token = 'FU4zeZpBEcIA6+GPDMprRcfwNJULp2FbWgPyiZBGD+k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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