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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8e5aa327ff25069c742f66e957e9ead0b466761ee65c67b3ba2ffc7d408e2026' 
  AND token = 'zfP/NcAH5RBvhMkf/397tL/2P9WgxRaQRBr+yd4Oy+g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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