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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02670f6beaa69ea22ec02b03207e9a99ca8d0c2c993ea65487bbb7a5cb8ed6b9' 
  AND token = '7mCh12ZWnNP3b8pbPDofZyWqaqrC8vfSwRwzNsxRDM0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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