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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd6b125b34c409af8a741e4c8975f00839f468cb0d4d597a51cce4b9750fe22a4' 
  AND token = 'Loa0DVA4FyhHynVrFTINdqMQCRQPZd/OGVXC8pVqAi8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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