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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e3990fef7d78d33bd96dc7989279aade44267272149f1fba492bd2e2bb58ba9f' 
  AND token = 'XhR9fB5mzoq28HfcUbLf/OIWKYuA6ysEvG3bvwJAm1s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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