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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3170584152d296560daccb7942c4b5ccaa3cf0c8cf986ed8684b7b6ba7ac330f' 
  AND token = 'Z+76tv1sc4r3yW9wW7RrIo7lMmwtuk6xhYtvzaA+GSQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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