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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5aba1459655361ab4c6343406290838505155ad2dd7c5d00f342a1e2c9f3c81d' 
  AND token = '7Em2TCr9H382y6w4hx6wDH1a8a/2SiJFOOVM8zaiRTM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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