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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a48e7d5f98398416c85042f083543eab4557d9471233670056c5dba90d361013' 
  AND token = 'qgIrib2kDoG2XnvCMY/0nhg+C33Pmt5of10hrD0sjpI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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