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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95913b7b5aaedb37c11d7ab0be3eb3914ec2375c3c05440ac2ba8226c61f39c5' 
  AND token = 'mUZA5QfN+072xIP8IIlYfnki2MxI1LvVC+TisbcL3ig=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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