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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '658787dc426162dc7b1ef12b305fb2e9dcf28a38ad308f230c4130a635b2c254' 
  AND token = 'xbnIxPe1RrNB8peyASH/7EocKQ60vFH5KOl7SjIu/9c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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