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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '17ce7cfcfee6bffd913a04f386611cd0db1837a06fb0f7000ba00d40f0f9bb9d' 
  AND token = 'GQa37frCHFlSdgHgh1HyUwcjv9az/h00IqOs4EDWAIY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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