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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '901d06ab906d0706b16caa110fc3c39cc0799e8bb4b681b6e9c177ede4b306d4' 
  AND token = '8+mA9jh8tsJkJb0beCZB8DtotFO3xPSZwcLuzSCOTGE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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