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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '929781044ba330f060577cc2c320b77e975a7e059e639d6fdbf096b4f8f8f252' 
  AND token = 'bJ1nPObLkWz1f0mwXl9WLoqtZTs/Tjo0dJibF3S88Sc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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