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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'adb8cf1526c0ef78cd66ae22784e5a2a696f08c98ba258987e1d40b04a76aae0' 
  AND token = 'qp6mLHiOQyAS7rCmSb8tAmsLjACdR/KsjIKgrtXDSpI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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