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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a753786e80ee3cfd74a7e7eabc5da452ed2d2eae4db6f5c28de3ed9b6751871e' 
  AND token = '/mq1E7TmAi7DxNuyTUy0R2XyPD4DImj22QQm0v/Ale0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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