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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5cc851b4a4715ca2d5fc5dffb1a0b6499c015476fd5ab7adf6a3a4ca7ff06475' 
  AND token = 'Xayd863F1ncj1vsJd4wsbz80DKcs2EBO5Wck6wSWCmY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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