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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '133823f0ff05d97c4313205b2ac37dae798ee1a09d872e5bc68203c9600f8f7f' 
  AND token = 'CYn/oFzo8I6emc67jSxGSGMzeK3/5/V3PZiaOPWRfsE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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