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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '80f3ef5a9ef89a163978334541c1f32a8e37c0fa32399ef95c579879bef966cd' 
  AND token = '2KejBKJVZZ6tSdhtG+auMjqSQRAeACFnK+TQHE1tOHs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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