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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e1d089cf60348731f8fb9b80fb6859404cb4c92c7dad9194bcfd667dd5702e5c' 
  AND token = 'MGL0WYmbU7x3Au6zGeUcC22g6WOKzNx2nufDG4WVEOU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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