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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f70a9eea65e413eb7213b69705be0037eefc4512b4d820a92ef82ab83505397' 
  AND token = 'Mb2w/x1RANokOF+VP7DiYKhr4QhQI4aYJ+MnB7OYzls=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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