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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7baa4e5b0ccd67c68c85b16a2a057a39e03fc217273047ca31ba25bbf9a30808' 
  AND token = 'hpxRUmeBVx56AQqF5fDJ31nocKGLxlx/Get8qLCqAC8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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