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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '39e0a864445fb2d99897a266118b7f973b87e2af406f65cf8ebe6dffa614aa85' 
  AND token = 'tbqrIR7VlJ2P5MpxWDhWhauIxJXs7jz8Ag6Uof9zdqY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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