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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96a4b6c5ea7b19b9836fa0b114fae59217081f7cf26572d733f490cce6dbb87d' 
  AND token = 'OswujKVlDGGCjrHdl10iKCrRabNR+iEVu2OFCM0srGQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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