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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'efef9c6065d5db67fe08b1916ce6387b613c0e86409257ad1cfbc1d28dd17fad' 
  AND token = 'n3saZF9IrYPHR81QoIFJBKSfn+gPF5svVu1MrxEu+pg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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