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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '01d185164d7682f222aca2758d134cd98e8c8335a2af0cd1f3f4d8fed66db9f4' 
  AND token = 'w2DHeEtcYBkQBvPBVwHaw/kuztXP7NN/v+dcrO5aGA0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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