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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '597375283dc50dc68fe63d53364d86daa3993a823d4e7ced4f28f0eac0665823' 
  AND token = 'pEf+RGwZBBQueWHajQA3aEzdt0yJUP3xIv5k42ODOVw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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