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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f156754ec6806fe0c349717deb6db1ac832f08bf806f519353eae2367edf3de' 
  AND token = 'aXUWWMdTa3U4uih0bm5jGE6To7usrr+p/LGOFJKAnqw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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