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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9e6ae6258f4b8d802b72ba7973c36d4c56c2affc5e53c7dcd697cd499775160' 
  AND token = 'I9Ze1ZedNiZ2+eMXgk56DqI9Hs042GSjES9peFOv1OI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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