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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f2340136fc81503ad2f31b415222eaba0aff7ff81a1525c89418e1cda794335' 
  AND token = '2LGC7LglME6dyg1HGt+rcn0mTM4LXB/M8sf0O5NA6Jg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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