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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '21d13e7c3eaf82d657bd48c4d116fa24925edffa6612314058f7dfd20550b983' 
  AND token = 'ptD2ly4YfDQJ2seMTbR2CV4ZsQHT7NjIbZi2xdbu43U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00086

JSON explain

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