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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8ec1efbfc295241a06b3fd80b4c79343706f53fe9a64232baf9a1221ff7b5c2' 
  AND token = 'fJercJjZlVvCden/tAYK0t1RdDtb2kob3DIu2/Hhd2I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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