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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63c98f9afb52df48f5d53ee2f8fdbc41c5ba45e57cb7a71d3afa4c41bafc75a1' 
  AND token = 'AFb8xu/KVbCmDMOwJF1LYMwX/irmEVDpK6+5Aj+tHwQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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