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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c44d6e2c4d7dd41a81358ad4f8934a7e97fccbc66cd13132e98bb0fb2c9e37e' 
  AND token = 'LCBMXfUaDcBr7YUyhn00hxQmpxE6ApvLX3xp1x99Eik=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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