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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d029f9dff3853ab0eb1ab9577cf8952165dca978814504f47ef0a3844a06cbc' 
  AND token = 'A7AlxHHI/SA5WeJ1kx6Zf9tTxAGBK4Q8cSNS8FhvhAc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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