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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9de2d5485850f8ea00b7979960df36e5c9fdbf614f52c19ac35a7d48e05d4ea' 
  AND token = 'GFU1IKp2wr8imgjWZZ9WU8aEZlqxlZkZZ4uGvt1wt3o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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