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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ce24a0419e098c0b1e880bd1013f56424ccb6b6d6fffde577536612e4999033' 
  AND token = 'ciVKX8erWnHj/XL4YTrPcBL5GeWmDGimRHZNlFTkdVc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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