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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '908c7d90392616141a364b513910ad6ef40a66f3691391d5ed66b077b5543ab9' 
  AND token = 'nIXd4+cHbpm9rmn7tAe2vfcmU0xLWyG7/1Bsgy1+0Jc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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