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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '04b1bb56a962c1c61b59c950068ae12fa70624b960f778459c230f39bf6f2fff' 
  AND token = 'VFP1uRhO5GDy20oFwpVq81jfjTDqaptFn/byJM77pMQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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