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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '04360e77ed7d45dc1ae2905fed00330663b59bf989b08edff8f93ca6aac7e735' 
  AND token = '+mjP+vR0W/2TiREy2GxJCUixVHwcM8Rjp8KClZx2R94=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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