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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '058ba2d8d6bcdce62d33e9ab9379b670d411bdf83384d463eaf8a14b33fa36b9' 
  AND token = '9evsOV8Bya4AaqTQqSns6fiiWgAY0EvTQkNqeKeD4i0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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