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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '231ea516c751bfdbb6e96b2ee48c97ed34a4c4f42940b884ce34d636049f6108' 
  AND token = 'vtoUP+jqbj8DvMvmQBkVMlM5Fh+s64vD65fRRfMYq7I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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