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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7582f3047ef503d189ec9b33186f1745d3198f3ec6119e9c462d87dd0b5349c8' 
  AND token = '6Ddsi/toOZOkoKwDcigfD+JaBjD7BBf3MBPseCVCYC0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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