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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e1d4f3d267d786959ed2f3d83791c1d2b10ebed75fd0ce7dbfe11ccfbb8fbcf1' 
  AND token = 'gyvzU2mGKl2MxsVnfRQQBPkXKGSShyxnQreoFw+lblE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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