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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c35dadc8fa67f2aea770e5a754f666f68a31f29224c2a5037738394dad2cf38' 
  AND token = 'MYd8MeVTUwrpFJwSQwOD6R2KQr4BO57YHDH0rc8Yr4I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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